Catalytic Asymmetric [3 + 2] Annulation of Hantzsch Esters with Racemic <i>N</i>-Sulfonylaziridines
作者:Guo-Sheng Zhu、Pei-Jun Yang、Chen-Xue Ma、Gaosheng Yang、Zhuo Chai
DOI:10.1021/acs.orglett.1c02931
日期:2021.10.15
Hantzsch esters (HEs) served as two-carbon partners in a copper(I)-catalyzed enantioselective [3 + 2] annulation with racemic 2-(hetero)aryl-N-sulfonyl aziridines via kinetic resolution to provide pyrrolo[2,3-b]tetrahydropyridines containing multiple contiguous stereogenic centers including all-carbon quaternary centers in excellent yields and enantiopurities and moderate-to-excellent diastereoselectivities
Hantzsch 酯 (HE) 在铜 (I) 催化的对映选择性 [3 + 2] 环化中通过动力学拆分与外消旋 2-(杂)芳基-N-磺酰基氮丙啶环化以提供吡咯并 [2,3- b ]四氢吡啶含有多个连续的立体中心,包括全碳四元中心,产率和对映纯度以及中等至优异的非对映选择性。主要取决于氮丙啶的结构,在某些情况下也观察到了以 HEs 作为氢源的竞争性氢解过程。